21781880

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1\times {\mathrm{113}}^1$

素因数の和:264

約数の個数: 64

約数和(自身を含む): 50889600

約数和(自身を除く): 29107720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 79, 113, 122, 158, 226, 244, 305, 316, 395, 452, 488, 565, 610, 632, 790, 904, 1130, 1220, 1580, 2260, 2440, 3160, 4520, 4819, 6893, 8927, 9638, 13786, 17854, 19276, 24095, 27572, 34465, 35708, 38552, 44635, 48190, 55144, 68930, 71416, 89270, 96380, 137860, 178540, 192760, 275720, 357080, 544547, 1089094, 2178188, 2722735, 4356376, 5445470, 10890940, 21781880]

約数ペア:

[(1, 21781880), (2, 10890940), (4, 5445470), (5, 4356376), (8, 2722735), (10, 2178188), (20, 1089094), (40, 544547), (61, 357080), (79, 275720), (113, 192760), (122, 178540), (158, 137860), (226, 96380), (244, 89270), (305, 71416), (316, 68930), (395, 55144), (452, 48190), (488, 44635), (565, 38552), (610, 35708), (632, 34465), (790, 27572), (904, 24095), (1130, 19276), (1220, 17854), (1580, 13786), (2260, 9638), (2440, 8927), (3160, 6893), (4520, 4819)]